Beijing: map of z value
Deciles of z value:
(-1.209, -0.386)
(-0.386, -0.031)
(-0.031, 0.126)
(0.126, 0.311)
(0.311, 0.517)
(0.517, 0.818)
(0.818, 1.281)
(1.281, 1.851)
(1.851, 3.485)
(3.485, 5.695)